Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

10. Acids and Bases

Buffers

GOB Chemistry

10. Acids and Bases

Buffers

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Multiple Choice

Which of the following combinations can result in the formation of a buffer?

HF and HI

HC₂H₃O₂ and NH₃

CH₃CH₂NH₂ and CH₃CH₂NH₃⁺

NaCl and NaOH

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Verified step by step guidance

Understand what a buffer is: A buffer solution is one that resists changes in pH when small amounts of acid or base are added. It typically consists of a weak acid and its conjugate base, or a weak base and its conjugate acid.

Analyze the first combination, HF and HI: HF is a weak acid, but HI is a strong acid. A buffer requires a weak acid and its conjugate base, not a strong acid, so this combination cannot form a buffer.

Examine the second combination, HC2H3O2 and NH3: HC2H3O2 (acetic acid) is a weak acid, and NH3 (ammonia) is a weak base. However, they do not form a conjugate acid-base pair, so this combination cannot form a buffer.

Consider the third combination, CH3CH2NH2 and CH3CH2NH3+: CH3CH2NH2 (ethylamine) is a weak base, and CH3CH2NH3+ is its conjugate acid. This combination can form a buffer because it consists of a weak base and its conjugate acid.

Evaluate the fourth combination, NaCl and NaOH: NaCl is a salt, and NaOH is a strong base. This combination does not include a weak acid or base with its conjugate, so it cannot form a buffer.